Here's what low certainty grade results mean: "low certainty (our confidence in the effect estimate is limited; the true effect could be substantially different from the estimate of the effect);".
Just so we're clear: you've never linked to research to support any of your points, because you're not able to, are you?
> Here's what low certainty grade results mean: "low certainty (our confidence in the effect estimate is limited; the true effect could be substantially different from the estimate of the effect);".
You're acting like its definition is "it's probably the opposite, and thus is evidence for my argument".
If something has “low quality” evidence, it means the observed estimate is highly likely to be different from the truth.
Face masks = low quality evidence.
So what’s the point of GRADE if we can conclude “evidence shows”?"
EDIT: Your link even says this
> Further high-quality research, including randomised trials of the optimum physical distance and the effectiveness of different types of masks in the general population and for health-care workers' protection, is urgently needed
Just so we're clear: you've never linked to research to support any of your points, because you're not able to, are you?